Fig. 21.
Example light curves of candidates for long-term variability in the stacked catalogue, produced as auxiliary catalogue products. The objects have no counterpart with SDSS classification within 5″, and their 3XMM-DR7 counterpart is not known to be short-term variable. Plot symbols inform about short- and long-term variability and non-detections in 3XMM-DR7 and are explained in Appendix B.4.
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